= Key (engineering)
{wiki=Key_(engineering)}
In engineering, a "key" typically refers to a mechanical component used to connect two rotating parts, allowing them to work together while also enabling easy assembly and disassembly. Keys are commonly used in applications where power transmission is required, for example in shafts, gears, pulleys, and couplings. There are several types of keys, including: 1. **Square Key**: A rectangular cross-section that fits into both a shaft and a hub. It prevents relative rotation between the two parts.
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